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Sorry for the delayed response topgunner. I only have the stock water separator on my truck, just talked to a buddy that has the Bull Dog fuel system on his truck. He told me it works great he gets a little better mileage and way better throttle response. He had looked at the FASS system also but doesn't remember why he chose Bull Dog. Said they are very similar. So I would say these things are legit. If you decide to get one let us know your take on it.
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